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Rollup merge of #149135 - nxsaken:const_residual_into_try_type, r=scottmcm

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Constify `residual_into_try_type`

Feature: `const_try_residual` (related to `try_trait_v2_residual`)
Tracking issue: rust-lang/rust#91285

Constify `residual_into_try_type` introduced in rust-lang/rust#148725.

r? ``@scottmcm``
This commit is contained in:
Stuart Cook
2025-11-21 14:44:43 +11:00
committed by GitHub
parent e397c5ddc1 5590d7db51
commit e7b9935fc5
1 changed files with 4 additions and 1 deletions
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library/core/src/ops/try_trait.rs
+4 -1
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@@ -371,11 +371,14 @@ pub const trait Residual<O>: Sized {
/// but importantly not on the contextual type the way it would be if
/// we called `<_ as FromResidual>::from_residual(r)` directly.
#[unstable(feature = "try_trait_v2_residual", issue = "91285")]
#[rustc_const_unstable(feature = "const_try_residual", issue = "91285")]
// needs to be `pub` to avoid `private type` errors
#[expect(unreachable_pub)]
#[inline] // FIXME: force would be nice, but fails -- see #148915
#[lang = "into_try_type"]
pub fn residual_into_try_type<R: Residual<O>, O>(r: R) -> <R as Residual<O>>::TryType {
pub const fn residual_into_try_type<R: [const] Residual<O>, O>(
r: R,
) -> <R as Residual<O>>::TryType {
FromResidual::from_residual(r)
}